A power plant taps steam superheated by geothermal energy to 421 K (the temperature of the...
A power plant taps steam superheated by geothermal energy to 421 K (the temperature of the hot reservoir) and uses the steam to do work in turning the turbine of an electric generator. The steam is then converted back into water in a condenser at 321 K (the temperature of the cold reservoir), after which the water is pumped back down into the earth where it is heated again. The output power (work per unit time) of the plant is 110 megawatts. Determine (a) the maximum efficiency (as a decimal number between zero and one) at which this plant can operate and (b) the minimum amount of rejected heat that must be removed from the condenser every twenty-four hours.
Homework Answers
Add Answer to:
A power plant taps steam superheated by geothermal energy to 421
K (the temperature of the...
In Geothermal-steam power cycle, the source of heat is the hot water from well. The heat...
In Geothermal-steam power cycle, the source of heat is the hot
water from well. The heat exchanger receive hot water at Tg1= 105
oC and the water leaves at 40 oC as shown in Figure 3. Steam exits
the boiler at 40 bar, 300 oC, and it exits the turbine at 1 bar.
Saturated liquid water exits the condenser at 1 bar. The plant
operate to generate 20 MW electric power with generator efficiency
of 0.95. The isentropic efficiency of...
Superheated steam at 20 MPa, 560oC enters the turbine of a vapor power plant. The pressure...
Superheated steam at 20 MPa, 560oC enters the turbine of a vapor power plant. The pressure at the exit of the turbine is 0.7 bar, and liquid leaves the condenser at 0.4 bar at 75oC. The pressure is increased to 20.1 MPa across the pump and the specific enthalpy is 338.14 kJ/kg. The turbine isentropic efficiency is 81%. Cooling water enters the condenser at 20oC with a mass flow rate of 70.7 kg/s and exits the condenser at 38oC. For...
2) A steam power plant operates on an ideal regenerative rankine cycle with superheated steam leaving...
2) A steam power plant operates on an ideal regenerative rankine cycle with superheated steam leaving the boiler, entering the turbine at 10 mPa,600C. X fraction of steam is extracted from the turbine at 0.6 mPa pressure for the high pressure open feedwater heater. Then x fraction more of steam is extracted from the turbine at 0.2 mPa pressure for the low pressure open feedwater heater . The condenser pressure in the cycle is 5 kPa. The mass flow rate...
(30 points) We are designing a geothermal flash steam power plant that pumps water from underground...
(30 points) We are designing a geothermal flash steam power plant that pumps water from underground geothermal reservoirs at 180 °C at 5 MPa to a tank at 150 °C. Some of the water flashes to produce saturated steam that is sent to a turbine and a water stream that is returned to the well. The output of the turbine is at 0.1 MPA. Assume that the system is well insulated. Determine: a. The flowrate of steam leaving the flash...
Thermo Final Exam open book open notes 2hrs 1. (10pts) A power plant can be described by an ideal Rankine cycle without any irreversibility's. he boiler produces superheated steam at a pressu...
Thermo Final Exam open book open notes 2hrs 1. (10pts) A power plant can be described by an ideal Rankine cycle without any irreversibility's. he boiler produces superheated steam at a pressure of 200 bars and temperature of 600c (1). The steam expands adiabatically (and isentropicly) thru a turbine exiting as a saturated vapor/liquid mixture at pressure of 0.1bar (2). The mixture passes thru a condenser (P-0.1bar) until it is all saturated liquid (3). It is then pumped adiabatically to...
Combined Gas and Steam Power Plant The highest temperature at the inlet of a gas turbine...
Combined Gas and Steam Power Plant The highest temperature at the inlet of a gas turbine can be 1600oC. The temperature of the ambient air is 27oC. Determine the maximum pressure ratio and the associated efficiency. Determine the conditions (temperatures and pressure) at the various points of the cycle. What’s the maximum temperature of the exhaust gases? Determine the amount of natural gas required for a 500 MW plant. Determine the associated emissions. What’s the total amount of exhaust gas?...
Steam generated in a power plant at a pressure of 8,600 kPa and temperature of 600°C...
Steam generated in a power plant at a pressure of 8,600 kPa and
temperature of
600°C is fed to a turbine. Exhaust from the turbine enters a
condenser at 10 kPa, where it is
condensed to saturated liquid, which is then pumped to the boiler.
The turbine and the pump in the Rankine cycle operate at 80% and
75% efficiency, respectively.
a. Determine the rates of heat transfer in the boiler
b.Determine the rate of heat transfer in the condenser...
A power plant using a Rankine power generation cycle and steam operates at a temperature of...
A power plant using a Rankine power generation cycle and steam operates at a temperature of 80 oC in the condenser, a pressure of 2.5 MPa in the boiler, and a maximum boiler temperature of 700 oC. Draw the two cycles described below on a temperature-entropy diagram for steam, and answer the following questions. a) What is the efficiency of this power plant, assuming the pump and turbine operate adiabatically and reversibly? What is the temperature of the steam leaving...
Steam is to be condensed in the condenser of a steam power plant at a temperature...
Steam is to be condensed in the condenser of a steam power plant
at a temperature of 50C with cooling
water from a nearby lake, which enters the tubes of the condenser
at 18C at a rate of 101 kg/s and leaves
at 27C. Determine the rate of condensation of the steam in the
condenser.
Steam is to be condensed in the condenser of a steam power plant at a temperature of 50°C with cooling water from a nearby lake,...
The figure shows a schematic of a power plant that has two steam turbines. The water...
The figure shows a schematic of a power plant that has two steam turbines. The water (the working fluid for the plant) leaves the high pressure turbine (HPT) as saturated vapour at 1000 [kPa]. Part of this flow is diverted to an insulated heat exchanger, which we hot airstream to create superheated steam that enters the low pressure turbine (LPT). The air mas flow rate is 19.5 k/s and the air temperature drops from 1100 to 6001 as it goes...
In Geothermal-steam power cycle, the source of heat is the hot
water from well. The heat exchanger receive hot water at Tg1= 105
oC and the water leaves at 40 oC as shown in Figure 3. Steam exits
the boiler at 40 bar, 300 oC, and it exits the turbine at 1 bar.
Saturated liquid water exits the condenser at 1 bar. The plant
operate to generate 20 MW electric power with generator efficiency
of 0.95. The isentropic efficiency of...
2) A steam power plant operates on an ideal regenerative rankine cycle with superheated steam leaving the boiler, entering the turbine at 10 mPa,600C. X fraction of steam is extracted from the turbine at 0.6 mPa pressure for the high pressure open feedwater heater. Then x fraction more of steam is extracted from the turbine at 0.2 mPa pressure for the low pressure open feedwater heater . The condenser pressure in the cycle is 5 kPa. The mass flow rate...
(30 points) We are designing a geothermal flash steam power plant that pumps water from underground geothermal reservoirs at 180 °C at 5 MPa to a tank at 150 °C. Some of the water flashes to produce saturated steam that is sent to a turbine and a water stream that is returned to the well. The output of the turbine is at 0.1 MPA. Assume that the system is well insulated. Determine: a. The flowrate of steam leaving the flash...
Thermo Final Exam open book open notes 2hrs 1. (10pts) A power plant can be described by an ideal Rankine cycle without any irreversibility's. he boiler produces superheated steam at a pressure of 200 bars and temperature of 600c (1). The steam expands adiabatically (and isentropicly) thru a turbine exiting as a saturated vapor/liquid mixture at pressure of 0.1bar (2). The mixture passes thru a condenser (P-0.1bar) until it is all saturated liquid (3). It is then pumped adiabatically to...
Steam generated in a power plant at a pressure of 8,600 kPa and
temperature of
600°C is fed to a turbine. Exhaust from the turbine enters a
condenser at 10 kPa, where it is
condensed to saturated liquid, which is then pumped to the boiler.
The turbine and the pump in the Rankine cycle operate at 80% and
75% efficiency, respectively.
a. Determine the rates of heat transfer in the boiler
b.Determine the rate of heat transfer in the condenser...
Steam is to be condensed in the condenser of a steam power plant
at a temperature of 50C with cooling
water from a nearby lake, which enters the tubes of the condenser
at 18C at a rate of 101 kg/s and leaves
at 27C. Determine the rate of condensation of the steam in the
condenser.
Steam is to be condensed in the condenser of a steam power plant at a temperature of 50°C with cooling water from a nearby lake,...
The figure shows a schematic of a power plant that has two steam turbines. The water (the working fluid for the plant) leaves the high pressure turbine (HPT) as saturated vapour at 1000 [kPa]. Part of this flow is diverted to an insulated heat exchanger, which we hot airstream to create superheated steam that enters the low pressure turbine (LPT). The air mas flow rate is 19.5 k/s and the air temperature drops from 1100 to 6001 as it goes...
Most questions answered within 3 hours.
-
3) What are the typical social structures in a global city?
asked 1 hour ago -
Luther Corporation
Consolidated Balance Sheet
December 31, 2019 and 2018 (in $ millions)
Assets
2019
2018...
asked 1 hour ago -
(Expected rate of return and risk) Carter Inc. is evaluating a
security. Calculate the investment’s expected...
asked 4 hours ago -
What specific indicators can point to lack of progress for
African Americans in American society?
asked 5 hours ago -
1-The Electrons in a beam are moving at 2.7×108 m/s in an
electric field of 15000...
asked 5 hours ago -
A gas tank is a vertical cylinder. It has a radius of 1m, a
height of...
asked 5 hours ago -
Accent Software faces the following conditions. All of these
support Accent’s use of a market-penetration pricing...
asked 6 hours ago -
A mathematically inclined friend emails you the following
instructions: "Meet me in the cafeteria the first...
asked 6 hours ago -
A monopoly sells in two countries . The demand curves in the two
countries are p1...
asked 7 hours ago -
A .15kg rubber ball is bounced off a wall. Before hitting the
wall, the ball moves...
asked 8 hours ago -
A manufacturing company preparing to build a new plant is
considering three potential locations for it....
asked 8 hours ago -
B. If compound Y has approximately the same values of solubility
in toluene as compound X,...
asked 9 hours ago